Envelope



Jdly 1, 1930. T. E. GJORUP 5 ENVELOPE I Original Fi led Jan. 14, 1926 ATTORNE YS Patented July 3. l&@

ED STATES PATENT FICE THOMAS E. GJOE'UP, OF CHICAGO, ILLINOIS,ASSIGNOB-OF ONE-THIRD T FRANK C. VOISINET, OF CHICAGO, ILLINOIS mwmornprovide an envelope in which means is provided for showing at once anyattempt to open the envelope. 1 A further object of my invention is toprovide an envelope or container having an adhesive which is incondition for immediately sealing the envelope without the use of water,but which will not be devoured by as insects, especially those found intropical countries which do devour gum, mucllage and glue.

Other objects and advantages will appear in the following specification,and the novel "2 features of the invention will be particularly pointedout in the appended claim.

My invention is illustrated in the accompanying drawings, forming partof this application, in which Figure 1 is a rear view of an envelopewith the adhesive applied thereto,

Figure 2 is a view of a portion of an en velope after it has been openedand rescaled, and

Figure 3 is a view of a blank for making a box and having adhesiveapplied thereto which does not require water for effective sealing ofthe parts of the box.

In carrying out my invention, I may make use of a blank for forming anenvelope of the ordinary shape. Thus in Figure 1, A is the main bodyportion, and B, C and D are the flaps which are integral therewith, 45and which, when folded, form the main conapplication filed January 14,1926, Serial 1T0. 81,277. Renewed September 30, 1829.

tainer. The flap E, when sealed, completes the envelope.

On the edge of the flap E, I dispose a sealing material F. This materialis pref 'erably some adhesive which does not require moistening, such asa rubber solution. Thus a solution of rubber in chloroform or benzol iswelladapted for the purpose.

A similar coating G is applied to the back of the envelope so that whenthe flap is folded over, the coatings F and G will register. I havefound that if the paper has a smooth surface, the .adhesive will adherebetter by roughening the paper before the adhesive is applied. Anenvelope thus applied with adhesive of the type described does not haveto be moistened, because it is only necessary to press the flap againstthe back portion-of the envelope to cause the two coatings F and G toadhere and to make a firm seal for the envelope. This obviates thenecessity of moistening the ummed surface as is ordinarily done, anddoes away with the unsanitary method of licking the envelope.

In Figure 3, I have shown a modified form, which, in this instance, is ablank for use in making boxes. Obviously, the adhesive material might beapplied to blanks of other shape than that shown for making boxeswithout departing from the spirit of the invention. In the presentinstance, the body portion H of the box has the flaps K, R, M and P. Theflaps R and P have auxiliary portions 7'. The ends of the flaps K and Mare coated with the adhesive on one side, while the portions r arecoated with solution on the opposite side. The boxes, or rather theblanks from which they are made, are shipped to the consumer flat, andin order to prevent the sticking of the adhesive, I may make use ofsheets of paraffin paper or the like.

In making the box, all that is necessary is to bend up the sides M andK, R and P,

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and bring the end portions 1', wl'iich have been treated with theadhesive on one side, into engagement with the adhesive covered ends ofthe portions M and K, thus causing the sides to adhere so as to completethe body portion of the box. In this form of the device, as well as theenvelope, no moisture is required for effecting the firm sealing of theparts.

In the case of the envelope, I have provided means whereby any attemptat opening the envelope and rescaling it will be detected. This consistsin impressing either before or after applying the adhesive a design ortrade mark, such as that shown at V in Figure 1. This may be either uponthe flap or upon the parts to which the flap is to be scaled. Owing tothe fact that the envelope cannot be opened by steaming it, any openingof the envelope by an unauthorized person who wishes to escapedetection, must be by pulling outwardly on the flap E. Even should hesucceed in separating the parts without tearing them, a portion of thedesign will be broken; that is to say, part of it may remain intact onthe flap, while the other part will adhere firmly to the coating G andthe paper will be torn so as to cause a parting of the design. In orderto reseal the flap, it is necessary to bring it down again-over thetreated portion G, or to recoat the parts to cause their adherence. Itis impossible to bring the separated parts of the design intoregistration, so that by holding the envelope up to the light, one cansee, as shown in Figure 2, that the design is not continuous, and hencethat the envelope must have been open. In certain instances, in order tofacilitate detection, I may use paper which is comparatively thin ortransparent.

I desire to call attention to the fact that such a device for detectingthe unauthorized opening of the envelope will not apply to themucilage-sealed envelope, because when such an envelope is opened bysteaming it, the desi n, especially if printed on the paper before t 1ecoating is made, will not be torn or broken, but it will be broken withan adhesive, such as I have described.

In shipping these envelopes, I may make use of strips of paraffin paper,or the like, which may be placed between the two adhesive surfaces forpreventing the sticking of the same inadvertently. These strips are ofcourse removed when it is desired to seal the envelope which may bedone,,as stated, by merely pressing the parts together.

I claim:

An envelope comprising a body portion having overlapping flaps securedtogether, a cover flap, said overlapping flaps and said cover flaphaving roughened registering portions, an adhesive coating insoluble inwater carried by the-inside edge of the cover flap and on the outer sideof the overlapping

